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@Lyliang777, I've replied to your PM. Will let you know as soon as I have more information.
I have the same issue: in 3g network (WCDMA/GSM mode in settings) phone has unstable network connection, and if it loses it - phone never tries to reconnect. Reconnects only after reboot or after turn on/ turn off "fly mode".
When I switch to 2G (GSM mode) - network is more stable, connection loosing was not reproduced.
For test - I've took Sony Experia XA and Nexus 5x with sim card of the same operator and put them near by (for checking if any issues in operator network). And I discovered that Nexus has 30-40% more steady signal.
I have the same problem. when connected with symbol H download stops and down arrow doesnt appear. I still see up arrow but no down arrow. Connection starts back, if I turn off and on LTE. I face no problem on edge connection.